I bought the
K&F filter set set which includes a CPL
I am not sure how it works as it does not seem to rotate like my Hoya CPL does...its just one piece of glass like my ND filters. I thought CPL means circular polorising lens which indicates to me that it should rotate. Have I mis-understood what I have bought?
You have the magnetic filter. You need to put the magnetic adapter on your lens; then you can attach the CPL and rotate it.
There are two types of adapter, an inlaid adapter that comes with a 3D printed tool for screwing it into or out of the lens filter thread, and an adapter that screws into the lens.
The advantage of this system is that it will have a lower profile than a traditional CPL lens if you use the inlaid adapter, as the depth of the CPL is a single low profile filter without the screw in mount that allows for rotation of the CPL.
In addition, you can manually rotate the CPL to get proper alignment before mounting it on camera. I use this technique to get a good approximation of how the filter should be aligned, so it only takes a small adjustment on camera to fine tune. This is a common advantage of magnetic mounts.
What I don't see on the listing you linked to is whether the kit includes the inlaid adapter and mounting tool. It's a very good price for the kit, but not so good if it lacks these items.
As for the lens cap; I don't like it because it's too hard to remove. They needed a different design to make it easier to grip and remove. I don't even take it out with me; I remove the filter and put the lens cap back on.
